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                <span class="article-type type-1 float-left">原</span>                <h1 class="title-article">MySQL中的WHERE子句</h1>
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                                                                                                                                            <span class="time">2017年03月31日 17:58:43</span>
                    <a class="follow-nickName" href="https://me.csdn.net/a781568222" target="_blank">念伱成痴</a>
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<p><strong>where子句中的运算符：</strong></p>
<p>    &lt;,&gt;,=,!=,&gt;=,&lt;=，in(),<span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">between""and"",and,not,or,like</span></p>
<p><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">1、其中 &lt;,&gt;,=,!=,&gt;=,&lt;=，in(),<span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">between and 属于比较运算符</span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;">       in(A,B):表示包含A和B的结果</span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">between
 1 and 5 :会查出在1和5之间的值包括1和5</span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">2、and，not，or属于逻辑运算符</span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where age&gt;4 and age &lt;14 ： 查询的出来的结果集中的age处于4和14之间，不包括4和14</span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where age&gt;4 or age &lt;3 : <span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">
查询的出来的结果集中的age有大于4的也有小于3的，不包括4和3</span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where not age&gt;4 ：<span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">查询的出来的结果集中的age没有大于4，可以等于4</span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">3、、like是模糊查询</span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where phone like '130%' 查询出user表中phone为130开头的用户</span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where phone like '130_' 查询出user表中phone为130开头后面只有一位的用户，比如1301</span><br /></span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where phone like '%130%' <span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">
查询出user表中phone中含有130的用户</span></span></span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"></span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">select
 * from user where phone like '%130'<span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">查询出user表中phone为130结尾的用户</span></span></span></span></span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;"><span style="color:rgb(51,51,51);font-family:Georgia, 'Times New Roman', Times, sans-serif;font-size:14px;">%为通配符，不限定位数</span></span></span></span></span></span></span></span></span></span></span></span></span></p>
<p><span style="font-family:Georgia, 'Times New Roman', Times, sans-serif;color:#333333;"><span style="font-size:14px;">_也是通配符，一个表示一位</span></span></p>
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